Liu J, Marsini MA, Bedell TA, Reider PJ, Sorensen EJ. Diastereoselective syntheses of substituted cis-
hydrindanones featuring sequential inter- and intramolecular Michael reactions.
Tetrahedron 2016;
72:3713-3717. [PMID:
27642195 PMCID:
PMC5021295 DOI:
10.1016/j.tet.2016.03.039]
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Abstract
The hydrindane (bicyclo[4.3.0]nonane) structural motif (1) and related cis-1-hydrindanone skeleton (2) are common substructures in many natural products. Herein, we describe efficient access to substituted cis-1-hydrindanones enabled by a sequence of Michael reactions. A copper-catalyzed intermolecular Michael addition of a cyclic silyl ketene acetal to a β-substituted-α-alkoxycarbonyl-cyclopentenone enables construction of a quaternary center and is followed, after incorporation of an additional Michael acceptor, by a second, intramolecular addition of a nucleophilic β-ketoester. This strategy affords stereoselective access to substituted bicyclic cis-hydrindanone ring systems containing up to three contiguous stereocenters.
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